r1470: Get the smb_trans2 structure out of the rap_cli_call struct.

r1470: Get the smb_trans2 structure out of the rap_cli_call struct.

Initial attempt at RAP server infrastructure. Look at rap_server.c for the
dummy functions that are supposed to implement the core functionality.

ipc_rap.c contains all the data shuffling. _rap_shareenum and _rap_serverenum2
in ipc_rap.c are (I think) regular enough to be auto-generated.

I did not test all the corner cases yet, but nevertheless I would like some
comments on the general style.

Volker

P.S: samba-3 smbclient now doesn't freak out anymore, although the results are
not entirely correct :-)
(This used to be commit 08140cc1a838b4eaa23c897b280a46c95b7ef3e0)